diff --git a/Changelog.md b/Changelog.md
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,3 +1,7 @@
+### 1.2.12.2
+
+- Use type synonym *LazyByteString* from *bytestring &ge; 0.11.2.0*.
+
 ### 1.2.12.1
 
 - Group Template Haskell declarations to fix Haddock out-of-scope errors.
diff --git a/NgxExport/Tools/Aggregate.hs b/NgxExport/Tools/Aggregate.hs
--- a/NgxExport/Tools/Aggregate.hs
+++ b/NgxExport/Tools/Aggregate.hs
@@ -47,9 +47,9 @@
 import           Network.HTTP.Client
 import           Foreign.C.Types
 import qualified Data.ByteString as B
-import qualified Data.ByteString.Char8 as C8
 import           Data.ByteString (ByteString)
-import qualified Data.ByteString.Lazy as L
+import qualified Data.ByteString.Char8 as C8
+import           Data.ByteString.Lazy (LazyByteString)
 import           Data.Map.Strict (Map)
 import qualified Data.Map.Strict as M
 import           Data.IORef
@@ -107,7 +107,7 @@
 -- import           NgxExport.Tools.Aggregate
 --
 -- import           Data.ByteString (ByteString)
--- import qualified Data.ByteString.Lazy.Char8 as C8L
+-- import           Data.ByteString.Lazy (LazyByteString)
 -- import           Data.Aeson
 -- import           Data.Maybe
 -- import           Data.IORef
@@ -125,7 +125,7 @@
 -- stats = unsafePerformIO $ newIORef $ Stats 0 0 0
 -- {-\# NOINLINE stats \#-}
 --
--- updateStats :: ByteString -> IO C8L.ByteString
+-- updateStats :: ByteString -> IO LazyByteString
 -- __/updateStats/__ s = voidHandler $ do
 --     let cbs = 'NgxExport.Tools.Read.readFromByteString' \@Int s
 --     modifyIORef\' stats $ \\(Stats bs rs _) ->
@@ -135,7 +135,7 @@
 --         in Stats nbs nrs nmbs
 -- 'NgxExport.ngxExportIOYY' \'updateStats
 --
--- reportStats :: Int -> Bool -> IO C8L.ByteString
+-- reportStats :: Int -> Bool -> IO LazyByteString
 -- __/reportStats/__ = 'deferredService' $ \\port -> voidHandler $ do
 --     s <- readIORef stats
 --     'reportAggregate' port (Just s) \"__/stats/__\"
@@ -344,7 +344,7 @@
             )
 
 receiveAggregate :: FromJSON a =>
-    Aggregate a -> L.ByteString -> ByteString -> IO L.ByteString
+    Aggregate a -> LazyByteString -> ByteString -> IO LazyByteString
 receiveAggregate a v sint = do
     let !s = decode' v
         !int = toNominalDiffTime $ readDef (Min 5) $ C8.unpack sint
@@ -485,14 +485,15 @@
 #ifdef SNAP_AGGREGATE_SERVER
             ,sigD uName [t|ByteString|]
             ,funD uName [clause [] (normalB [|C8.pack f|]) []]
-            ,sigD fName [t|AggregateServerConf -> Bool -> IO L.ByteString|]
+            ,sigD fName [t|AggregateServerConf -> Bool -> IO LazyByteString|]
             ,funD fName
                 [clause []
                     (normalB [|$(varE nameF) $(storage) $(varE uName)|])
                     []
                 ]
 #endif
-            ,sigD recvName [t|L.ByteString -> ByteString -> IO L.ByteString|]
+            ,sigD recvName
+                [t|LazyByteString -> ByteString -> IO LazyByteString|]
             ,funD recvName
                 [clause []
                     (normalB [|$(varE nameRecv) $(storage)|])
diff --git a/NgxExport/Tools/EDE.hs b/NgxExport/Tools/EDE.hs
--- a/NgxExport/Tools/EDE.hs
+++ b/NgxExport/Tools/EDE.hs
@@ -45,6 +45,7 @@
 import           Data.ByteString (ByteString)
 import qualified Data.ByteString.Char8 as C8
 import qualified Data.ByteString.Lazy as L
+import           Data.ByteString.Lazy (LazyByteString)
 import qualified Data.ByteString.Lazy.Char8 as C8L
 import           Data.ByteString.Base64.URL
 #if MIN_VERSION_base64(1,0,0)
@@ -86,9 +87,10 @@
 --
 -- import           Data.ByteString (ByteString)
 -- import qualified Data.ByteString.Lazy as L
+-- import           Data.ByteString.Lazy (LazyByteString)
 -- import qualified Network.HTTP.Types.URI as URI
 --
--- urlDecode :: ByteString -> L.ByteString
+-- urlDecode :: ByteString -> LazyByteString
 -- urlDecode = L.fromStrict . URI.urlDecode False
 --
 -- 'ngxExportYY' \'urlDecode
@@ -260,11 +262,11 @@
 -- | Renders an EDE template from a JSON object.
 --
 -- This is the core function of the /renderEDETemplate/ handler. Accepts a JSON
--- object written in a 'L.ByteString' and a key to find a compiled EDE template
--- declared by the /compileEDETemplates/ handler.
-renderEDETemplate :: L.ByteString       -- ^ JSON object
+-- object written in a 'Data.ByteString.Lazy.ByteString' and a key to find a
+-- compiled EDE template declared by the /compileEDETemplates/ handler.
+renderEDETemplate :: LazyByteString     -- ^ JSON object
                   -> ByteString         -- ^ Key to find the EDE template
-                  -> IO L.ByteString
+                  -> IO LazyByteString
 renderEDETemplate = renderEDETemplateWith decode extraEDEFilters
 
 -- | Renders an EDE template with custom decoding function and filters.
@@ -272,11 +274,11 @@
 -- Choice of the decoding function makes EDE available for templating from any
 -- configuration language that maps to the Aeson's 'Value'.
 renderEDETemplateWith
-    :: (L.ByteString -> Maybe Value)    -- ^ Decoding function
+    :: (LazyByteString -> Maybe Value)  -- ^ Decoding function
     -> HashMap Id Term                  -- ^ Collection of extra filters
-    -> L.ByteString                     -- ^ JSON object
+    -> LazyByteString                   -- ^ JSON object
     -> ByteString                       -- ^ Key to find the EDE template
-    -> IO L.ByteString
+    -> IO LazyByteString
 renderEDETemplateWith fdec flt v k = do
     tpls <- readIORef templates
     case HM.lookup k tpls of
@@ -307,7 +309,7 @@
 -- as /key|$hs_json/.
 renderEDETemplateFromFreeValue
     :: ByteString           -- ^ Key to find the EDE template | JSON object
-    -> IO L.ByteString
+    -> IO LazyByteString
 renderEDETemplateFromFreeValue = uncurry (flip renderEDETemplate) .
     second (L.fromStrict . C8.tail) . C8.break (== '|')
 
diff --git a/NgxExport/Tools/PCRE.hs b/NgxExport/Tools/PCRE.hs
--- a/NgxExport/Tools/PCRE.hs
+++ b/NgxExport/Tools/PCRE.hs
@@ -15,6 +15,7 @@
 --
 -----------------------------------------------------------------------------
 
+
 module NgxExport.Tools.PCRE (
     -- * Matching against regular expressions
     -- $matchingPCRE
@@ -37,6 +38,7 @@
 import           Data.ByteString (ByteString)
 import qualified Data.ByteString.Char8 as C8
 import qualified Data.ByteString.Lazy as L
+import           Data.ByteString.Lazy (LazyByteString)
 import           Data.List
 import qualified Data.List.NonEmpty as NE
 import           Data.Maybe
@@ -169,7 +171,7 @@
 
 type RegexF = Regex -> ByteString -> IO ByteString
 
-rtRegex :: RegexF -> ByteString -> IO L.ByteString
+rtRegex :: RegexF -> ByteString -> IO LazyByteString
 rtRegex f = fmap L.fromStrict . uncurry doRtRegex .
     second C8.tail . C8.break (== '|')
     where doRtRegex k v = do
@@ -196,7 +198,7 @@
 -- This is the core function of the /matchRegex/ handler.
 matchRegex
     :: ByteString           -- ^ Key to find the regex, and the value
-    -> IO L.ByteString
+    -> IO LazyByteString
 matchRegex = rtRegex doMatchRegex
 
 -- $substitutionPCRE
@@ -220,11 +222,11 @@
 -- import           NgxExport
 -- import           NgxExport.Tools.PCRE
 --
--- import           Data.ByteString (ByteString)
 -- import qualified Data.ByteString as B
--- import qualified Data.ByteString.Lazy as L
+-- import           Data.ByteString (ByteString)
+-- import           Data.ByteString.Lazy (LazyByteString)
 --
--- gsubSwapAround :: ByteString -> IO L.ByteString
+-- gsubSwapAround :: ByteString -> IO LazyByteString
 -- __/gsubSwapAround/__ = 'gsubRegexWith' $ const $ \\case
 --     a : d : b : _ -> B.concat [b, d, a]
 --     \_ -> B.empty
@@ -313,7 +315,7 @@
 -- This is the core function of the /subRegex/ handler.
 subRegex
     :: ByteString       -- ^ Keys to find the regex and the sub, and the value
-    -> IO L.ByteString
+    -> IO LazyByteString
 subRegex = rtRegex $ doSubRegex sub Nothing
 
 -- | Pastes /functional/ substitutions using a named regex and a function.
@@ -322,7 +324,7 @@
 subRegexWith
     :: SubPasteF        -- ^ Function to paste substitutions
     -> ByteString       -- ^ Keys to find the regex and the sub, and the value
-    -> IO L.ByteString
+    -> IO LazyByteString
 subRegexWith = rtRegex . doSubRegex sub . Just
 
 -- | Pastes a named /plain/ substitution using a named regex.
@@ -333,7 +335,7 @@
 -- This is the core function of the /gsubRegex/ handler.
 gsubRegex
     :: ByteString       -- ^ Keys to find the regex and the sub, and the value
-    -> IO L.ByteString
+    -> IO LazyByteString
 gsubRegex = rtRegex $ doSubRegex gsub Nothing
 
 -- | Pastes /functional/ substitutions using a named regex and a function.
@@ -343,7 +345,7 @@
 gsubRegexWith
     :: SubPasteF        -- ^ Function to paste substitutions
     -> ByteString       -- ^ Keys to find the regex and the sub, and the value
-    -> IO L.ByteString
+    -> IO LazyByteString
 gsubRegexWith = rtRegex . doSubRegex gsub . Just
 
 
@@ -354,7 +356,7 @@
 
 ngxExportSimpleServiceTyped 'declareRegexes ''InputRegexes restartPromptly
 
-compileRegexes :: ByteString -> IO L.ByteString
+compileRegexes :: ByteString -> IO LazyByteString
 compileRegexes = voidHandler' $ do
     !inputRegexes <- fromJust <$> readIORef storage_InputRegexes_declareRegexes
     let !compiledRegexes =
diff --git a/NgxExport/Tools/Prometheus.hs b/NgxExport/Tools/Prometheus.hs
--- a/NgxExport/Tools/Prometheus.hs
+++ b/NgxExport/Tools/Prometheus.hs
@@ -43,7 +43,7 @@
 import qualified Data.HashSet as HS
 import           Data.ByteString (ByteString)
 import qualified Data.ByteString.Char8 as C8
-import qualified Data.ByteString.Lazy as L
+import           Data.ByteString.Lazy (LazyByteString)
 import qualified Data.ByteString.Lazy.Char8 as C8L
 import           Data.IORef
 import           Data.Text (Text)
@@ -529,7 +529,7 @@
                           T.breakOn "@" k
               in T.concat [b, e, a]
 
-showPrometheusMetrics :: PrometheusMetrics -> L.ByteString
+showPrometheusMetrics :: PrometheusMetrics -> LazyByteString
 showPrometheusMetrics = TL.encodeUtf8 . M.foldlWithKey
     (\a k (h, ms) ->
         let k' = TL.fromStrict k
@@ -590,7 +590,7 @@
                           ,n'
                           )
 
-toPrometheusMetrics :: ByteString -> IO L.ByteString
+toPrometheusMetrics :: ByteString -> IO LazyByteString
 toPrometheusMetrics v = do
     let cs = fromJust $ readFromByteStringAsJSON @AllMetrics v
     pc <- readIORef conf
@@ -622,7 +622,7 @@
 -- on conversion failure which results in returning an empty string.
 scale1000
     :: ByteString   -- ^ Floating point value
-    -> L.ByteString
+    -> LazyByteString
 scale1000 v = let v' = fromJust $ readFromByteString @Double v
               in C8L.pack $ show $ scale 1000 v'
 
@@ -868,7 +868,7 @@
 extractValues = filter ((&&) <$> not . C8.null <*> isDigit . C8.head)
                 . C8.splitWith ((&&) <$> not . isDigit <*> (/= '.'))
 
-statusLayout :: ByteString -> L.ByteString
+statusLayout :: ByteString -> LazyByteString
 statusLayout = C8L.pack . intercalate "," . map show . statuses
     where statuses s = runST $ do
               a <- newArray bs 0 :: ST s (STUArray s Int Int)
@@ -888,12 +888,12 @@
 cumulativeValue' :: (Num a, Read a) => ByteString -> a
 cumulativeValue' = foldr ((+) . (read . C8.unpack)) 0 . extractValues
 
-cumulativeValue :: ByteString -> L.ByteString
+cumulativeValue :: ByteString -> LazyByteString
 cumulativeValue = C8L.pack . show . cumulativeValue' @Int
 
 ngxExportYY 'cumulativeValue
 
-cumulativeFPValue :: ByteString -> L.ByteString
+cumulativeFPValue :: ByteString -> LazyByteString
 cumulativeFPValue = C8L.pack . show . cumulativeValue' @Double
 
 ngxExportYY 'cumulativeFPValue
diff --git a/NgxExport/Tools/Resolve.hs b/NgxExport/Tools/Resolve.hs
--- a/NgxExport/Tools/Resolve.hs
+++ b/NgxExport/Tools/Resolve.hs
@@ -17,6 +17,7 @@
 --
 -----------------------------------------------------------------------------
 
+
 module NgxExport.Tools.Resolve (
     -- * Dynamic upstreams in Nginx
     -- $dynamicUpstreams
@@ -50,7 +51,7 @@
 import           Network.HTTP.Client.BrReadWithTimeout
 import           Data.ByteString (ByteString)
 import qualified Data.ByteString.Char8 as C8
-import qualified Data.ByteString.Lazy as L
+import           Data.ByteString.Lazy (LazyByteString)
 import           Data.Map.Strict (Map)
 import qualified Data.Map.Strict as M
 import qualified Data.HashMap.Strict as HM
@@ -412,11 +413,11 @@
 httpManager = unsafePerformIO newTlsManager
 {-# NOINLINE httpManager #-}
 
-getResponse :: Text -> (Request -> IO (Response L.ByteString)) ->
-    IO L.ByteString
+getResponse :: Text -> (Request -> IO (Response LazyByteString)) ->
+    IO LazyByteString
 getResponse url = fmap responseBody . (parseUrlThrow (T.unpack url) >>=)
 
-getUrl :: Text -> IO L.ByteString
+getUrl :: Text -> IO LazyByteString
 getUrl url = getResponse url $ flip httpLbsBrReadWithTimeout httpManager
 
 minimumTTL :: TTL -> [TTL] -> TTL
diff --git a/NgxExport/Tools/ServiceHookAdaptor.hs b/NgxExport/Tools/ServiceHookAdaptor.hs
--- a/NgxExport/Tools/ServiceHookAdaptor.hs
+++ b/NgxExport/Tools/ServiceHookAdaptor.hs
@@ -47,9 +47,10 @@
 -- import           NgxExport
 -- import           NgxExport.Tools.ServiceHookAdaptor ()
 --
--- import           Data.ByteString (ByteString)
 -- import qualified Data.ByteString as B
+-- import           Data.ByteString (ByteString)
 -- import qualified Data.ByteString.Lazy as L
+-- import           Data.ByteString.Lazy (LazyByteString)
 -- import           Data.IORef
 -- import           Control.Monad
 -- import           Control.Exception
@@ -65,7 +66,7 @@
 -- secretWord = unsafePerformIO $ newIORef ""
 -- {-\# NOINLINE secretWord \#-}
 --
--- testSecretWord :: ByteString -> IO L.ByteString
+-- testSecretWord :: ByteString -> IO LazyByteString
 -- __/testSecretWord/__ v = do
 --     s <- readIORef secretWord
 --     when (B.null s) $ throwIO SecretWordUnset
@@ -74,7 +75,7 @@
 --                  else \"\"
 -- 'NgxExport.ngxExportIOYY' 'testSecretWord
 --
--- changeSecretWord :: ByteString -> IO L.ByteString
+-- changeSecretWord :: ByteString -> IO LazyByteString
 -- __/changeSecretWord/__ s = do
 --     writeIORef secretWord s
 --     return \"The secret word was changed\"
@@ -196,7 +197,7 @@
 --
 -- ==== File /test_tools_extra_servicehookadaptor.hs/: reset the secret word
 -- @
--- resetSecretWord :: ByteString -> IO L.ByteString
+-- resetSecretWord :: ByteString -> IO LazyByteString
 -- __/resetSecretWord/__ = const $ do
 --     writeIORef secretWord \"\"
 --     return \"The secret word was reset\"
@@ -234,7 +235,7 @@
 -- properly log the reset case.
 --
 -- @
--- changeSecretWord :: ByteString -> IO L.ByteString
+-- changeSecretWord :: ByteString -> IO LazyByteString
 -- __/changeSecretWord/__ s = do
 --     writeIORef secretWord s
 --     return $ \"The secret word was \" \`L.append\` if B.null s
diff --git a/NgxExport/Tools/Subrequest.hs b/NgxExport/Tools/Subrequest.hs
--- a/NgxExport/Tools/Subrequest.hs
+++ b/NgxExport/Tools/Subrequest.hs
@@ -65,6 +65,7 @@
 import qualified Data.ByteString as B
 import qualified Data.ByteString.Char8 as C8
 import qualified Data.ByteString.Lazy as L
+import           Data.ByteString.Lazy (LazyByteString)
 import qualified Data.ByteString.Lazy.Char8 as C8L
 import           Data.IORef
 import qualified Data.Text.Encoding as T
@@ -104,7 +105,7 @@
 -- import           NgxExport.Tools.Subrequest
 --
 -- import           Data.ByteString (ByteString)
--- import qualified Data.ByteString.Lazy as L
+-- import           Data.ByteString.Lazy (LazyByteString)
 --
 -- makeRequest :: ByteString -> 'NgxExportService'
 -- __/makeRequest/__ = const . 'makeSubrequest'
@@ -252,7 +253,7 @@
 data SubrequestConf =
     SubrequestConf { srMethod          :: ByteString
                    , srUri             :: String
-                   , srBody            :: L.ByteString
+                   , srBody            :: LazyByteString
                    , srHeaders         :: RequestHeaders
                    , srResponseTimeout :: ResponseTimeout
                    , srManager         :: ConnectionManager
@@ -305,19 +306,20 @@
           setTimeout _ = undefined
 
 subrequest :: (String -> IO Request) ->
-    (Response L.ByteString -> L.ByteString) -> SubrequestConf ->
-    IO L.ByteString
+    (Response LazyByteString -> LazyByteString) -> SubrequestConf ->
+    IO LazyByteString
 subrequest parseRequestF buildResponseF sub@SubrequestConf {..} = do
     man <- getManager sub
     req <- parseRequestF srUri
     buildResponseF <$> httpLbsBrReadWithTimeout (makeRequest sub req) man
 
-subrequestBody :: SubrequestConf -> IO L.ByteString
+subrequestBody :: SubrequestConf -> IO LazyByteString
 subrequestBody = subrequest parseUrlThrow responseBody
 
-type FullResponse = (Int, [(ByteString, ByteString)], L.ByteString, ByteString)
+type FullResponse =
+    (Int, [(ByteString, ByteString)], LazyByteString, ByteString)
 
-handleFullResponse :: IO L.ByteString -> IO L.ByteString
+handleFullResponse :: IO LazyByteString -> IO LazyByteString
 handleFullResponse = handle $ \e -> do
     let msg = C8.pack $ show e
         responseXXX = (, [], "", msg)
@@ -336,14 +338,14 @@
                     _ -> response500
             _ -> response500
 
-buildFullResponse :: Response L.ByteString -> L.ByteString
+buildFullResponse :: Response LazyByteString -> LazyByteString
 buildFullResponse r =
     let status = statusCode $ responseStatus r
         headers = map (first original) $ responseHeaders r
         body = responseBody r
     in Binary.encode @FullResponse (status, headers, body, "")
 
-subrequestFull :: SubrequestConf -> IO L.ByteString
+subrequestFull :: SubrequestConf -> IO LazyByteString
 subrequestFull = handleFullResponse . subrequest parseRequest buildFullResponse
 
 httpManager :: Manager
@@ -406,7 +408,7 @@
 -- /haskell_var_empty_on_error/.
 makeSubrequest
     :: ByteString       -- ^ Subrequest configuration
-    -> IO L.ByteString
+    -> IO LazyByteString
 makeSubrequest =
     maybe (throwIO SubrequestParseError) subrequestBody .
         readFromByteStringAsJSON @SubrequestConf
@@ -434,7 +436,7 @@
 -- manager.
 makeSubrequestWithRead
     :: ByteString       -- ^ Subrequest configuration
-    -> IO L.ByteString
+    -> IO LazyByteString
 makeSubrequestWithRead =
     maybe (throwIO SubrequestParseError) subrequestBody .
         readFromByteString @SubrequestConf
@@ -532,12 +534,11 @@
 -- import           NgxExport.Tools.Subrequest
 --
 -- import           Data.ByteString (ByteString)
--- import qualified Data.ByteString.Lazy as L
+-- import qualified Data.ByteString.Char8 as C8
 --
 -- import           Network.HTTP.Client hiding (path)
 -- import qualified Network.Socket as S
 -- import qualified Network.Socket.ByteString as SB
--- import qualified Data.ByteString.Char8 as C8
 --
 -- configureUdsManager :: ByteString -> 'NgxExportService'
 -- __/configureUdsManager/__ = 'ignitionService' $ \\path -> 'voidHandler' $ do
@@ -756,7 +757,7 @@
 -- /makeSubrequestFull/.
 makeSubrequestFull
     :: ByteString       -- ^ Subrequest configuration
-    -> IO L.ByteString
+    -> IO LazyByteString
 makeSubrequestFull =
     maybe (return $
               Binary.encode @FullResponse
@@ -773,7 +774,7 @@
 -- /makeSubrequestFullWithRead/.
 makeSubrequestFullWithRead
     :: ByteString       -- ^ Subrequest configuration
-    -> IO L.ByteString
+    -> IO LazyByteString
 makeSubrequestFullWithRead =
     maybe (return $
               Binary.encode @FullResponse
@@ -787,7 +788,7 @@
 -- /extractStatusFromFullResponse/.
 extractStatusFromFullResponse
     :: ByteString       -- ^ Encoded HTTP response
-    -> L.ByteString
+    -> LazyByteString
 extractStatusFromFullResponse = C8L.pack . show .
     (\(a, _, _, _) -> a) . Binary.decode @FullResponse . L.fromStrict
 
@@ -803,7 +804,7 @@
 -- found.
 extractHeaderFromFullResponse
     :: ByteString       -- ^ Encoded HTTP response
-    -> L.ByteString
+    -> LazyByteString
 extractHeaderFromFullResponse v =
     let (h, b) = mk *** C8.tail $ C8.break ('|' ==) v
         (_, hs, _, _) = Binary.decode @FullResponse $ L.fromStrict b
@@ -816,7 +817,7 @@
 -- /extractBodyFromFullResponse/.
 extractBodyFromFullResponse
     :: ByteString       -- ^ Encoded HTTP response
-    -> L.ByteString
+    -> LazyByteString
 extractBodyFromFullResponse =
     (\(_, _, a, _) -> a) . Binary.decode @FullResponse . L.fromStrict
 
@@ -830,7 +831,7 @@
 -- subrequest. Non-/2xx/ responses are not regarded as exceptions as well.
 extractExceptionFromFullResponse
     :: ByteString       -- ^ Encoded HTTP response
-    -> L.ByteString
+    -> LazyByteString
 extractExceptionFromFullResponse = L.fromStrict .
     (\(_, _, _, a) -> a) . Binary.decode @FullResponse . L.fromStrict
 
@@ -948,7 +949,7 @@
 contentFromFullResponse
     :: HashSet HeaderName   -- ^ Set of not forwardable response headers
     -> Bool                 -- ^ Do not forward /X-Accel-.../ response headers
-    -> (L.ByteString -> ByteString -> L.ByteString)
+    -> (LazyByteString -> ByteString -> LazyByteString)
                             -- ^ Function to compose response body and exception
     -> ByteString           -- ^ Encoded HTTP response
     -> ContentHandlerResult
@@ -986,7 +987,7 @@
 --
 -- ==== File /test_tools_extra_subrequest.hs/: auxiliary read body handler
 -- @
--- reqBody :: L.ByteString -> ByteString -> IO L.ByteString
+-- reqBody :: LazyByteString -> ByteString -> IO LazyByteString
 -- reqBody = const . return
 --
 -- 'ngxExportAsyncOnReqBody' \'reqBody
@@ -1132,8 +1133,8 @@
                 req { requestBody = RequestBodyStreamChunked givesPopper }
 
 bridgedSubrequest :: (String -> IO Request) ->
-    (Response L.ByteString -> L.ByteString) -> BridgeConf ->
-    IO L.ByteString
+    (Response LazyByteString -> LazyByteString) -> BridgeConf ->
+    IO LazyByteString
 bridgedSubrequest parseRequestF buildResponseF BridgeConf {..} = do
     manIn <- getManager bridgeSource
     manOut <- getManager bridgeSink
@@ -1155,10 +1156,10 @@
             httpLbsBrReadWithTimeout
                 (makeStreamingRequest givesPopper bridgeSink reqOut') manOut
 
-bridgedSubrequestBody :: BridgeConf -> IO L.ByteString
+bridgedSubrequestBody :: BridgeConf -> IO LazyByteString
 bridgedSubrequestBody = bridgedSubrequest parseUrlThrow responseBody
 
-bridgedSubrequestFull :: BridgeConf -> IO L.ByteString
+bridgedSubrequestFull :: BridgeConf -> IO LazyByteString
 bridgedSubrequestFull =
     handleFullResponse . bridgedSubrequest parseRequest buildFullResponse
 
@@ -1197,7 +1198,7 @@
 -- /haskell_var_empty_on_error/.
 makeBridgedSubrequest
     :: ByteString       -- ^ Bridge configuration
-    -> IO L.ByteString
+    -> IO LazyByteString
 makeBridgedSubrequest =
     maybe (throwIO BridgeParseError) bridgedSubrequestBody .
         readFromByteStringAsJSON @BridgeConf
@@ -1239,7 +1240,7 @@
 -- must be listed in this order.
 makeBridgedSubrequestWithRead
     :: ByteString       -- ^ Bridge configuration
-    -> IO L.ByteString
+    -> IO LazyByteString
 makeBridgedSubrequestWithRead =
     maybe (throwIO BridgeParseError) bridgedSubrequestBody .
         readFromByteString @BridgeConf
@@ -1254,7 +1255,7 @@
 -- /makeBridgedSubrequestFull/.
 makeBridgedSubrequestFull
     :: ByteString       -- ^ Bridge configuration
-    -> IO L.ByteString
+    -> IO LazyByteString
 makeBridgedSubrequestFull =
     maybe (return $
               Binary.encode @FullResponse
@@ -1271,7 +1272,7 @@
 -- /makeBridgedSubrequestFullWithRead/.
 makeBridgedSubrequestFullWithRead
     :: ByteString       -- ^ Bridge configuration
-    -> IO L.ByteString
+    -> IO LazyByteString
 makeBridgedSubrequestFullWithRead =
     maybe (return $
               Binary.encode @FullResponse
diff --git a/ngx-export-tools-extra.cabal b/ngx-export-tools-extra.cabal
--- a/ngx-export-tools-extra.cabal
+++ b/ngx-export-tools-extra.cabal
@@ -1,5 +1,5 @@
 name:                       ngx-export-tools-extra
-version:                    1.2.12.1
+version:                    1.2.12.2
 synopsis:                   More extra tools for Nginx Haskell module
 description:                More extra tools for
         <https://github.com/lyokha/nginx-haskell-module Nginx Haskell module>.
@@ -37,7 +37,7 @@
   default-language:         Haskell2010
   build-depends:            base >= 4.8 && < 5
                           , template-haskell >= 2.11.0.0
-                          , bytestring >= 0.10.0.0
+                          , bytestring >= 0.11.2.0
                           , base64 >= 0.3.0.0
                           , ngx-export
                           , ngx-export-tools >= 1.2.6
